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Actinote sp.
Another group of nasty guys (as Bayucca says...) :-)
Yes, a bit "nasty" to identify to species (their spines only look harmful), though all Actinote larvae I have encountered share a subdued coloration and very similar pattern . . .
http://www.dreamstime.com/caterpillar-im... (Actinote spp.)
http://naturecloseups.com/posts/caterpil... (Actinote pellenea complex)
http://www.flickr.com/photos/mario_marti... (Actinote genitrix)